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Regenerative power with variable frequency drive

An induction motor, although not specifically designed to generate power, will generate power back into the lines as long as the magnetic field in the rotor is sustained. When calculating electrical faults on load centers, one needs to consider this effect for the initial stage of the fault until the magnetic fields collapse on the motors attached to it.

The variable frequency drive is good at maintaining the rotor magnetism while reducing the frequency, since the VFD is designed for that. But most VFDs are not going to pass that energy back to the AC supply unless it has special circuitry to do so. If one busses many VFD drives together using the DC bus connection, the energy will flow back naturally and feed other loads. Otherwise the DC bus will overvoltage and often trip the variable frequency drive. A braking resistor is sometimes used to burn off the excess energy too.

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